1322 Tur VecerasBLe Inpustry 1n New York State 
a plant is decidedly more free from disease than its neighbors, 
save seed from it and try it out the next year. Plant different 
varieties and examine for differences in disease resistance. 
Spraying. Many blight and dead spot diseases can be controlled 
by applying some material which is destructive to the causal 
parasite but harmless to the crop. For perfect control all sus- 
ceptible parts must be kept coated with the spray material in 
order to prevent entrance of the parasite, for once entrance has 
been gained spraying is useless. Spray before rains, not after, 
for the parasite requires moisture to gain entrance to a plant, and 
well-made spray mixtures do not wash off. Bordeaux is the stand- 
ard material for vegetable spraying. For fruits lime-sulphur 
has largely taken the place of bordeaux, but it has in no case heen 
sufficiently tested on vegetables to warrant its substitution for 
bordeaux. Careful tests have shown that in some cases lime 
sulphur actually checks the growth of vegetables. 
Bordeaux, 5-5-50, which is the formula usually used, consists 
of 5 pounds copper sulphate, 5 pounds high-grade stone lime and 
50 gallons water. The copper sulphate is dissolved by suspend- 
ing in a sack in the top of a few gallons of water in a wooden 
vessel. The stone lime is slaked in a separate vessel by adding 
water a little at a time. Both are then diluted to 25 gallons and 
poured together in this diluted condition. After thorough stirring 
the mixture is ready for use. Fresh hydrated lime may be used 
in place of the stone lime. If there is any doubt about the lime 
being high-grade and fresh, get an ounce of yellow prussiate of 
potash at a drug store, dissolve it in a pint of water, and add a 
few drops to the well stirred bordeaux. If the solution shows no 
change in color the bordeaux is all right, but if it turns dark 
brown as soon as it strikes the bordeaux, the lime was either 
low-grade or air-slaked, and the bordeaux will burn foliage if 
used. Add lime from a fresh supply until the prussiate solution 
does not change color. 
Where smooth glossy plants like asparagus are sprayed, it is 
advisable to use a sticker with the bordeaux. Boil 2 pounds 
resin, 1 pound sal soda crystals and 1 gallon water in an iron 
kettle until clear, which requires one to one and one-half hours. 
Add this to 50 to 100 gallons of bordeaux. 
